Indium (In) standard solution, 10,000 µg/mL in 2.0 mol/L HNO₃. This specialty chemical is used as a calibration standard in analytical chemistry for techniques such as ICP-MS, ICP-OES, and atomic absorption spectroscopy (AAS) to quantify Indium levels in environmental, geological, metallurgical, and industrial samples. It ensures precise and traceable measurements for quality control and research applications. The nitric acid matrix provides stability and compatibility with common digestion and analysis methods.